131508691 has 2 divisors, whose sum is σ = 131508692. Its totient is φ = 131508690.

The previous prime is 131508661. The next prime is 131508701. The reversal of 131508691 is 196805131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131508691 - 2²³ = 123120083 is a prime.

It is not a weakly prime, because it can be changed into another prime (131508631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65754345 + 65754346.

It is an arithmetic number, because the mean of its divisors is an integer number (65754346).

Almost surely, 2^131508691 is an apocalyptic number.

131508691 is a deficient number, since it is larger than the sum of its proper divisors (1).

131508691 is an equidigital number, since it uses as much as digits as its factorization.

131508691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 131508691 is about 11467.7238805266. The cubic root of 131508691 is about 508.5318419426.

The spelling of 131508691 in words is "one hundred thirty-one million, five hundred eight thousand, six hundred ninety-one".